Spark-plug tester.



w G. CLIN-K'. SPARK PLUGESTEB; APPLICATION F'ILED MAR. 26. 1917.

Pafcented 'Apr. 1, 19 19;

ZjlNVENTQR I WITNESSES ATTORNEY UNITED STATES PATENT orrrcn;

WALTER G. CLINK, 01E DANVILLE, ILLINOIS.

SPARK-PLUG TESTER.-

Y Application filed March 26, 1917. Serial No. 157,490.

- first papers of naturalization in the United ,at a minimum cost.

States,) residing at Danville, in the county of Vermilion and State of Illinois, have invented certain new and useful Improvements in Spark-Phi Testers, of which the following is a speci cation.

This invention relates to a spark plug tester and the principal object of the invention is to provide a simple and efficient device of this nature which will show whether or not the plug is firing without removing the plug from the motor and without detaching the wires.

Another object of the invention is to provide means whereby there is no danger of the person using the device being shocked while he is testing the plug.

Another object of the invention is to provide means whereby the terminals may be ground or sandpapered when necessary.

Another object of the invention is to provide a device of this character which is simple and durable in construction, reliable and efficient in operation, and one which can be manufactured and placed upon the market The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described and specifically pointed. out in the appended claim.

In describing my invention in detail, reference will ,be had to the accompanying drawings, wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure l is a view, showing the invention in use on a spark plug.

Fig. 2 is a section on the line 2-2, Fig. 1.

In these drawings, the spark plug is indicated at 1 and the tester at 2, said tester consisting of a body portion 3 made to conform to the shape of the hand and having an enlarged end 4 in which is an opening 5, said handle portion having a hole 6 at its other end by which the device may be hung up. I prefer to form this part of the invent on of leather or any suitable non-conducting Specification of Letters Patent.

Patented A r. '1, 1919.

material. The drawing shows this part made ,of two pieces of leather cemented together, 1

I embed two curved wires 7 and 8 in the enlarged end of said body portion and each of said wires has one end projecting into the opening 5 and its other end projecting from the extreme outer edge of said body part, said body part having its end cut on the arc of a circle as at 9 so as to form two hornlike projections 10 whose edges form acute angles with each other, and through the tips of these horns said wires project, thus throwing said projecting ends of the wires well beyond thebody portion.

When the spark plug is to be tested, the device is applied thereto as in Fig. 1, that is with one of the wires touching the body part of the plug and the other wire engaging with the central electrode. Thus, if the plug is in working condition a spark will be seen at the opening 5, caused by the current jumping from one wire to the other, but if the plug is not in working condition, no spark will appear, thus showing that the plug is defective.

As the handle portion is made of nonconducting material, there is no danger of the user being shocked, and the device is so small that-it may be carried in the pocket or in one of the pockets of the automobile. By making the horns acute at their outer ends, the wires 8 where they project may easily be ground or sand-papered when it becomes necessary. By makin each wire arcuate in its length, it is possible to open the pieces of leather constituting one horn and readjust the wire therein, in case it is found desirable to enlarge or diminish the spark gap so as to adjust it to the strength comprising a pair of arcuate wires standlng.

in a single arc with their contiguous ends slightly separated, and a handle composed of two strips of leather of like configuration having holes neartheir front ends adapted to register when the strips are superposed vQ 1,293,59a

upon each other, the front ends of said with the wires interposed between their forstrips being shaped into acute-angled horns ward ends. 1

adapted to overlie said wires with the excep- In testimony whereof I :iflix my signature tion of. their outer extremities When the in presence oftwo witnesses. holes? expose their contiguous extremities \VALTER G. CLINK.

,andqth'is end of the strips being dished be VVitnesses':

.tween' ssgid" horns, and cementitious matter I IVANHOL WV. HAsKrNs, connecting the st-rlps of leather face to face, M. D. LANE. 

